Device for operating loom shears



Sept. 20, 1966 L. J. LLAD6 .DEVICE FOR OPERATING LOOM SHEARS 2 Sheets-Sheet 1 Filed June 15, 1964 M .IA n 5% w;

p 6 L. J. LLAD 3,273,603

DEVICE FOR OPERATING LOOM SHEARS Filed June 15, 1964 2 Sheets-Sheet 2 ,1 INVEINTOR JM! 1400 1400 BY i 6% United States Patent 3 Claims. (Cl. 139-127 In looms, more particularly of the stationary weft kind, where the weft yarn has to be cut after being drawn through the shed, gripped by the weft-carrying gripper and beaten up by the slay in order that the consecutive picks may lead to the formation of the fabric, there are many devices for operating the shears, which are usually disposed on one or both sides of the slay and at the end of the travel of the weft yarn through the shed. Many suggestions have been made to control the cutting of the weft yarn, but all of them encounter difficulties in connection with the speed of the pick and with adjustment of the cut, more particularly in the case of shears which are fitted to the slay. Since the slay is in continuous oscillation, it is diflicult to adjust the cut even in relatively low-speed looms. It is also diflioult to make the shears cut simultaneously as the weft yarn moves in association with the operation of the slay, more particularly where high picking speeds are required. Another disadvantage is the need for lubrication, since lubrication leads to splashes which stain the fabric.

The device according to this invention has been devised to obviate these disadvantages. As will be clearly seen hereinafter, the device according to the invention has considerable provision for all kinds of adjustment so that the speed, opening and cutting of the shears can be accurately controlled and shears operation synchronised with weft yarn movements. The device according to the invention therefore helps to increase picking speed and completely obviates the need for lubrication.

The device according to the invention mainly comprises a support member which is borne by the side member of the loop framing. The support member, whose position can be adjusted to suit the advance of the slay, carries a member formed with an angular slot with a roller slidable therein by particular movements of the slay; in its movements the roller guides the elements controlling one or more shear blades disposed on the slay so that such blade or blades is or are operated by the said elements exactly when the slay beats up the weft. The member formed with the angular slot can be moved relatively to the support member to provide a control of the opening and timing of the operation of the shears. The support member is formed with a straight slot through which the position of the support member relatively to the loom framing and to the position of the slay can be varied, to give a very accurate control of cutting.

The elements moving the or each shear comprise a lever rigidly secured at one end to the spindle carrying the or each moving blade of the shears, while the other end of such lever comprises the spindle on which the said roller rotates freely. The or each shears blade is disposed in the slay and is operated by the said elements when the slay beats up the weft yarn.

For the sake of high-speed operation and smoothness of sliding of the roller in the angular slot without any need for lubrication, the member formed with the angular slot is made of nylon or some other appropriate material which damps impacts and requires no lubrication. Such member is fitted to the support member in readily releasable fashion so as to be readily interchangeable with other similar members formed with angular slots of slightly different shapes and sizes, in order to adjust the opening of the shears blades and to accurately provide the cutting pattern best suited to the kind of fabric being produced and to the technological characteristics of the yarn.

The beating-up action of the slay after the pick initiates the movement of the lever, and such movement is guided and controlled by the roller which moves from one end to the other of the angular slot, so that the or each shear is closed and the weft yarn is cut. There is therefore complete synchronisation between slay movement and shears movement and the weft yarn is cut exactly at the time required.

A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings, in which:

FIGURE 1 shows the member formed with an angular slot and the support member which is carried by the loom framing, with the slay in the vertical position and at the start of cutting, the movement position being shown in chain lines,

FIGURE 2 shows the member formed with an angular slot and the bearing member which is carried by the loom framing, in the cutting position produced by movement of the shears-operating roller when the slay beats up the weft, the position of the movement being shown in chain-lines,

FIGURE 3 is a plan view of the bearing member to which the member formed with the angular slot is secured,

FIGURE 4 is a front view of the complete mechanism,

FIGURE 5 is a section taken along the line A--A of FIGURE 4, and

FIGURE 6 shows details of the member which is formed with the angular slot and which is appropriately secured to the associated support member.

Referring to the drawings, a support member 2 bears against and is secured to loom framing 1; the position of the support member 2 relatively to a slay 4 can be adjusted through a straight slot 3. A rod-like bottom member 5 is carried by the support member 2 by means of a clamp 6 and is clamped fast by means of a screw 7. With this arrangement, the position of the system formed by the members 5, 5' can be varied vertically relatively to the support member 2. The member 5 is formed with an angular slot 8 and is made of an impact-proof material, such as nylon or the like, requiring no lubrication; the member 5' is secured to the member 5 in readily releasable manner, for instance by screws 9. A roller 10 mounted on an arm 11 so engages in the angular slot 8 as to be freely slidable therein. By way of captive screws 12, the arm 11 operates a spindle 13 on which one or more cutting blades 14 is or are disposed. The blades 14 are operated, to cut a weft yarn 15, by the movement of the slay 4 which makes the roller 10 move in the slot 8 so that the lever 11 is operated. The position of the slot 8 can be varied by raising or lowering the members 5, 5 to vary the adjustment of the shears-operating mechanism.

Any additions and changes of details not aifecting the main features of this invention can be made in practical embodiments of the device hereinbefore described.

What I claim is:

1. In a loom having a stationary frame, a reciprocating slay and shear means for the weft yarn, carried by said slay, a device operating said shear 'means comprising a first support member secured to said frame in adjustable relation to said slay, a second support member secured to said first support member for vertical adjustment, said second support member being provided with an angular slot, a roller movable in said slot, and a lever attached to said roller and actuating said shear means in synchronism with the movement of the slay so as to effect the cutting operation when the slay has beaten up the yarn.

2. In a loom as claimed in claim 1 wherein said second support member is in two parts namely a rod-like bottom member which is secured to said first support member, and a second part which is actually formed with the angular slot and which is detachably secured to the rodlike bottom member in order to be replaceable in order that the shape and dimensions of the angular slot may suit the cutting pattern in each particular case.

3. In a loom as claimed in claim 2 wherein said second support member formed with the angular slot is made of an impact-damping material and requires no lubrication.

References Cited by the Examiner UNITED STATES PATENTS 553,814 1/1896 Northrop 139-265 865,973 9/1907 Poalk 139-126 958,874 5/1910 Hunt 139-126 2,246,086 6/1941 Austin 28-1 2,420,380 5/1947 Moe'ssinger 139-126.1 2,928,428 3/1960 Dunham 139-126 3,014,504 12/1961 Pfarrwaller 139-126 3,137,321 6/ 1964 Wasylewiez 139-122 3,147,778 9/1964 Reyes 139-265 X 3,157,208 11/1964 Juillard 139-127 FOREIGN PATENTS 544,960 7/ 1922 France.

94,432 10/ 1897 Germany.

MERVIN STEIN, Primary Examiner.

DONALD W. PARKER, Examiner.

J. KEE CHI, Assistant Examiner. 

1. IN A LOOM HAVING A STATIONARY FRAME, A RECIPROCATING SLAY AND SHEAR MEANS FOR THE WEFT YARN, CARRIED BY SAID SLAY, A DEVICE OPERATING SAID SHEAR MEANS COMPRISING A FIRST SUPPORT MEMBER SECURED TO SAID FRAME IN ADJUSTABLE RELATION TO SAID SLAY, A SECOND SUPPORT MEMBER SECURED TO SAID FIRST SUPPORT MEMBER FOR VERTICAL ADJUSTMENT, SAID SECOND SUPPORT MEMBER BEING PROVIDED WITH AN ANGULAR SLOT, A ROLLER MOVABLE IN SAID SLOT, AND A LEVER ATTACHED TO SAID ROLLER AND ACTUATING SAID SHEAR MEANS IN SYNCHRONISM WITH THE MOVEMENT OF THE SLAY SO AS TO EFFECT THE CUTTING OPERATION WHEN THE SLAY HAS BEATEN UP THE YARN 